*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
a{
    text-decoration: none;
}
.container::after{
    content: "";
    display: block;
    clear: both;
}
.container{
    width: 870px;
    margin: auto;
}
header{
    background: #54afdb;
    color: #ffffff;
    margin-bottom: 60px;
}
header a{
    color: #ffffff;
}
/*头部*/
nav{
    padding-top: 12px;
    padding-bottom: 12px;
    margin-bottom: 70px;
}
nav .col{
    width: 33.333333%;
    float: left;
}
nav::after{
    content: "";
    display: block;
    clear: both;
}
nav a img{
    display: none;
}
.col-left{
    height: 10px;
}
.col-center{
    text-align: center;
}
.col-right{
    font-weight: bold;
    text-align: right;
}
.col-right a{
    font-size: 12px;
    position: relative;
    top: 5px;
}
/*banner部分*/
.banner .col{
    width: 50%;
    float: left;
}
.banner::after{
    content: "";
    display: block;
    clear: both;
}
.banner p{
    font-weight: bold;
}
.banner h1{
    font-weight: 300;
    font-size: 36px;
    margin-bottom: 24px;
}
.banner a{
    border-radius: 2px;
    font-weight: bold;
    font-size: 12px;
    background: #2996cc;
    padding: 15px 50px;
    display: inline-block;
    transition: 0.5s;
}
.banner a:hover{
    background: #2782c8;
}
.banner img{
    display: block;
    width: 100%;
}
/*list部分*/
.list{
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: 60px;
    padding-bottom: 60px;
}
.list .col{
    padding-left: 10px;
    padding-right: 10px;
    text-align: center;
    width: 25%;
    float: left;
}
.list img{
    margin-bottom: 10px;
}
.list h3{
    font-size: 14px;
    margin-bottom: 10px;
}
.list p{
    font-size: 14px;
    color: #778191;
}
/*download部分*/
.download{
    text-align: center;
    margin-bottom: 60px;
}
.download h2{
    font-size: 28px;
    font-weight: 300;
    color:#2e3b4e;
    margin-bottom: 20px;
}
.download p{
    color: #667083;
    margin-bottom: 30px;
}
/*底部部分*/
footer {
    background: #1b2126;
    color: #67737a;
    padding-top: 60px;
    padding-bottom: 60px;
}

/*响应式代码*/
@media (max-width: 600px) {
    .container{
        width: 80%;
    }
    .banner .col{
        width: 100%;
        text-align: center;
    }
    .banner a{
        margin-bottom: 20px;
    }
    nav a span{
        display: none;
    }
    nav a img{
        display: inline-block;
    }
    .list .col{
        width: 100%;
    }
}